Liquid door-check.



No. 696,776. Patented Apr. I, |902.

H. G. VOIGHT. LIQUID DOOR CHECK.

(Appliation med Jan. 20.1900.) (N o M o d el ngz.

Unitarian drains A Bauamt Ormea.

HENRY G. VOICI-IT, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE RUSSELL dv ERWIN MANUFACTURING COMPANY, OF NEW BRITAIN CONNECTICUT.

LIQUID DOOR-CHECK SPECIFICATION forming' part of Letters Patent No. 696,776, dated April 1, 1902. Application filed January 20, 1900. Serial No. 2,179. (No model.)

.To a/ZZ whom, it may concern:

Be it known that I, HENRY G. Voierrr, a citizen of the United States, residing in New Britain, in the county of Hartford and State of Connecticut,have invented certain'new and useful Improvements in Liquid Door-Checks, of which the followingis a specification.

My invention relates to improvements in liquid door-checks; and the main object of my invention is to relieve the seam at the capped end of the cylinder from the pressure of the piston.

In the accompanying drawings, Figure lis afront elevation of my door-check. Fig. 2 is a longitudinal section of the same on the line @a fc of Fig. l. Fig. 3 is a transverse section of the same on the lineg/ fy ofrFig. 2, and Fig. 4 is a detached view showing the inner face of the cap.

A designates the cylinder, the same being cast with its sides and one end 5 all in one piece of cast metal, the holding-brackets 6 being preferably cast integral therewith. The other end of the cylinder is closed by means of the removable cap B,which is screwed in up against a shoulder 7 in the ordinary manner. The cylinder internally is for the major portion of its length of a diameter suitable to receive and guide the piston C, while for a distance at the capped end fully equal to the length of the full stroke of the piston it is counter-bored to receive the supplementary cylinder 8. This cylinder I form with a solid end from sheet metal, the inner diameter being such as to fit the piston C and form a continuation of the inner wall of the major portion of the cylinder.

I have shown the piston C as made hollow to receive the spring 9, the other end of which spring is received by the spring-seat l0, which is made adjustable on the solid end 5 of the cylinder by means of the screw 1l for varying the tension of the spring. The piston is reciprocated by means of the crank-shaft l2 and crank 13, the pin of which enters the slot 14 at one side of the piston, as shown in Fig. 3, the said crank-shaft being adapted to receive any ordinary means (not shown) for properly connecting the check with a door and its casin g. The crank-shaft is supported in bearings l5, formed on the cylinder, the crank being covered by the plate 16. One side of the piston is slabbed off, as at l?, opposite where the crank-shank partly projects into the interior of the cylinder.

The piston is provided at its forward end with a suitable valve or valves, the same being represented as ball-valves 18, which are loosely held in position by means of the washer being in excess of the thickness of the metal in the supplemental cylinder 8, so that there is a free passage on the outside of the supplemental cylinder from the vent-valve 2l to the opposite end of the cylinder, whereby the leak through the vent-valve at the front end of the piston may readily pass around to the rear end of the piston Without being confined under pressure.

By my improvement the piston in its forward stroke moves toward the capped end of the cylinder, while the body of the liquid that is acted upon by the said forward stroke is confined under pressure within the supplemental cylinder, whereby the seam at the capped end is relieved from pressure and therefore is not liable to leak, as is the casein ordinary liquid checks,where the piston in its forward stroke moves toward the said capped end. Although the liquid passing through the vent-valve comes in contact with the seam at the capped end of the cylinder, it will not be forced through said seam, because the said fluid is always free to iow to the opposite end of the cylinder.

It is apparent that some changes from the specific construction herein disclosed may be made, and therefore I do not wish to be understood as limiting myself tothe precise form of construction shown and described, but de- IOS sire the liberty to make such changes in Working my invention as may fairly come Within the spirit and scope of the same.

I am aware that the patent to Bardsley, No. 441,274, November 25, 1900, shows and describes a door-check having an inclosing'casing of a box-like form, square in cross-section, with a cap on one side extending the entire length of the said casing, a cylinder inclosed within the said casing and secured against movement therein by means of a screw extending through a lug on the cylinder into the casing, and a piston operating Within the said cylinder; also, that other doorcheck patents show a cylinder with one solid end and one capped end and a piston acting to coniine liquid under pressure between the end of the piston and the solid end of the cylinder also, a cylinder with a cap at each end,

so that the piston necessarily forces the liquid against the seam at one of the said capped ends, while another patent for a spring-hinge and check shows one hinge-knuckle in the form of a cylinder of different diametersV at its respective ends, with a piston-rod having a head at each end, oneot' which heads is iitted to the smaller diameter of the said cylinder and the other to the larger diameter. The larger end of the cylinder is capped, and the piston acts to confine the liquid within the said larger end and between the end of the piston and the seam at the capped end of the said cylinder or hinge-knuckle.

said prior art is hereby disclaimed.

By my improvement the cylinder is provided with a lining which effectively closes the seam at the capped end and without All of the changing the general form of the cylinder, While at the same time the construction is inexpensive. My check diers from all the prior art hereinbefore disclaimed in that the cylinder is provided with a lining.

I claim as my invention- 1. In a liquid door-check, the combination of a piston and cylinder counterbored at one end, with a thin supplemental cylinder having one open and one solid end and with its sides itted closely within the supporting counter-bored portion of the saidy cylinder and with the edge of the metal at its open end abutting the shoulder formed by the said counterbore, and a cap for closing the counterbored end of the said cylinder and pressing against the solid end of the supplemental cylinder for holding it in place, whereby the said capped end of the cylinder is provided with a lining to prevent the seam thereof from leaking under the pressure of the piston, substantially as described.

2. In a liquid door-check, the combination of a cylinder having an open end, with a cap for closing the said end, a thin supplemental cylinder of the same form as the surrounding inner wall of the main cylinder and closely fitting the same to form a lining therefor, the surroundingwall of the main cylinder serving as a support for the said lining under pressure and a piston fitted Within the said lining, substantially as described.

HENRY G. VOIGHT.

Witnesses:

M. S. WIARD, P. M. BRoNsoN. 

